Question

An automobile starting from rest at t0 = 0 at x0 = 0 undergoes constant acceleration in a straight line. It is observed to pass two marks separated by 64 m, the first at t = 8s and the second at t = 12s. What is the value of the acceleration?
d = 1/2 a t^2

1/2 a(12^2 - 8^2) = 64

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